Power-indicator.



Patented May I3, |902.

H. MLLER.

POWER INDIGATUR.

(Application led Jan. 16, 1902.)

- /NvENro ATTORNEYS W/TNESSES UNITED STATES.

PATENT Cerros.

HERMANNMLLER, oF'LEIPsIc, GERMANY.*

POWER-'INDICATOR SPECIFICATION forming part of Letters Patent No.700,150, dated May' 13, 1902.k

i Application filed January 16, 1902. Serial No. 90,077. (No model.)

To a/ZZ whont t may' concern:

Be it known that- I, HERMANNMLLER, a citizen of the Empire of Germany,`residing in Leipsic, in the Kingdomf of Saxony and Em-4 equalizing thelocation of the springs rela- Y tively to their centers of gravity twoor more spiral springs areemployed and in which the varying strengthofthe power transmitted is indicated in connection with intermediatemechanical means and a previously-determined curve on a suitablecounting device, as will be fully described hereinafter and finallypointed out in the claims. V

In the accompanying drawings, Figure 1 represents a verticallongitudinal section of my improved power-indicator. vertical transversesection on line A B, Fig. l; and Figs. 3 and 4 show the connection of myimproved power-indicator with a pair of actuatingeccentrics;

Similar letters of reference indicate corre- Spending parts.v

My improved power-indicator is composed of a cylindrical pulley,y a,which forms at the same time a casing and which is so arranged on a hubVas to turn around the' same; pulley 'ci is connected'by means of two ormore spiral springs e c' with the yhub Za', said springs forming theelastic member between the pulley ct and the hub b. The two springs. cc' are equal in width, strength, length, andl weight and are attached tothe inner surface,

o'f the rim of ,theopulley a at d d in such a manner as to be transposedtoward each other at an angle of one hundred and ei, ;ht'.ylde`y As thesprings c c are of equallength,

0rees. the fastenings of the innerends of the springs to the hub at e e'are likewise at diametrically opposite points to each other. By thisdisposition of the .springsc c' their .position relal tively'to theircenters-of gravity is always equalized toward thearxis of rotation,which is ofl considerable value in the accurate functioning ofthepower-indicator, especially at high speeds of rotation. y f v Thespring-carrying hub b is either attached to the shaft ofthetran'smitting mechanism or Fig. 2 is ay Thev to the driving-shaft rofthe machine whose power is to be indicated. Therim of the pulley agissupported by radial armsVv of a nave mounted on the hub b, and the frontofthepulley is provided with a coverthatfcarries a curve'g, by which the,axially-shiftinggmo tien of the pulley a relatively to lthe l hub b istransmitted by a pinm on aneccentric camh.

The curve g has a definite form, which correspends with the arrangementof theintermediate mechanical links by which the axially shifting-motionis transmitted to a counter n, more or less as in lthe similar deviceset forth in Letters Patent granted to Julius Wilhelm Von Pittler, No.592,442, dated "October 26, 1897. The form of the curve gis determined,

so that the shifting angle of the counter end i is in proportion withthe shifting angle formed between the pulleyy a and hub Z9. fTheoperation of the improved power-indicat or willbe readily understoodfrom the foll lowing description: The driving-belt turns the pulley a inthe direction of the arrowv shownv inFig. 2, by `which the pulley is.

turned relatively to the hub b. The greater the power used the greaterwill be the'relaytive angular motion betweenl the pulley a' and the'hubb-t'. e., the transmitting-shaft f-for the reason thatvthe spiralsprings c care set YAs the` eccentric h is placed on the grooved rim ofa second' eccentric i, which is connected with the hub b, the eccentrich is enabled to make a greater orsmaller stroke, according to theshifting angle of the pulley, which stroke is transmitted bymeansof thelever o .onto the counter n. lig.` 3 showsthe position of the eccentrics7i, andt'relatively to each other when no powenis transmitted, Fig. 4

their position when power is transmitted.

Having thus described vmy invention, I

claim as new and desire to secure by Letters VPatent-- 1. Apower-indicator, comprising a shaft t0 be'drivem a hub o'n the same, apulley and a lmetrically opposite points, and the inner ends thereof areconnected at diametrically opposite points with the hub atan angle ofninety degrees relatively to the outer ends so that 15 the locations ofthe centers of gravity of the springs are equalized relatively to theaxis of rotation, substantiallyas set forth.

In testimony that I claim the foregoing as myinvention I have signed myname in preszo ence of two subscribing Witnesses.

HERMANN MLLER Witnesses:

FRIEDR. KORNER, RUDOLPH FRICKE.

